Another interesting and important application of the modern kite has been conceived by Professor J. Woodbridge Davis, principal of the Woodbridge Boys' School, in New York, who is one of the most famous kite-flyers in the world, in addition to being a distinguished scientist and mathematician. It was Professor Davis who invented the dirigible kite several years ago, three strings allowing the operator to steer the kite from right to left at will or to make it sink to earth. Having perfected this curious kite, which is of hexagon shape, is covered with oiled silk, is foldable, portable, and has a tail, Professor Davis turned his attention to his more recent and important discovery of the dirigible buoy, which bids fair to do much to lessen the dangers of shipwreck. For months past Professor Davis, assisted by Mr. Eddy, has been experimenting on the Kill von Kull with this buoy, and has obtained most encouraging results. There are two kinds, both being designed to be attached to kite lines and drawn over the water by the power of the kite. The simpler variety is merely a long wooden tube about three inches in diameter and shaped very much like a gun projectile, with a cone of tin dragging behind to give steadiness. It is for use only when the wind is blowing in exactly the direction in which it is designed to send a message or carry a rope. It will be observed that, in a large number of cases when ships are driven on rocks, the wind is blowing toward the shore, and in such cases a line of kites would readily carry one of these buoys ashore with the important words inside or the still more important rope following after.
Not satisfied, however, with this buoy, Professor Davis sought some means of making kites draw a load across the water in any direction desired, regardless of the way the wind might be blowing; and, after much thought and calculation, he hit upon what is now known as the Davis buoy, an object that has become familiar to dwellers at Bergen Point and Port Richmond, from the frequent experiments on the Kill that have been carried on during the past year. This form of buoy is much larger than the other, being three or four feet in length; and its essential feature is a deep iron keel that projects below out of the block of wood forming the body. It is evident that this keel will tend to keep the buoy headed in any given direction; and stability of position is further assured by the presence of guy-ropes attached to the main line of the kite. Each buoy is provided with three of these ropes, which, by being lengthened or shortened, may cause the buoy to form any desired angle with the kite-cord, and to keep it. Professor Davis has entirely succeeded in making the kites drag the buoy along the water in various directions in the very strongest gales--in fact, under precisely the conditions that would assist when the buoys would be needed for life-saving service from wrecks. And he is positive that, with further experiment, he will be able, by moving along the shore until a tacking angle is reached, not only to send lines, food, or messages to a disabled vessel from the shore, but to bring back by the same kites and the same buoy other lines and messages from the people in distress.